Tolstoy's trilogy of " childhood "," juvenile " and " youth " was a work full of emotion, psychological description, and philosophy of life. It mainly narrated the protagonist Nicholas Ostrovsky's childhood, juvenile, and youth growth experience, showing the characteristics and problems of Russian society, family, education, and culture. It also explored the philosophical problems of people's inner world, values, and outlook on life. At the same time, it also showed Tolstoy's profound literary foundation and outstanding creative talent. " Childhoods " mainly described Nicholas Ostrovsky's childhood growth experience. It described his life and childhood in his hometown of Khabalovsk, including his family, relatives, friends, school, religion and education. It showed a real Russian rural life and social environment. At the same time, it also described Nicholas Ostrovsky's psychological changes and growth process as the protagonist. It revealed his understanding of human nature, family, friendship and faith. " Teenager " mainly narrated Nicholas Ostrovsky's growing up experience in his youth. It described his experiences in school, social, politics, and culture, including his interactions with his classmates, participation in revolutionary movements, and the changes in his understanding and thoughts. It showed the image of a rebellious, confused, and awakened teenager. At the same time, it also revealed his views and attitudes towards love, friendship, responsibility, and faith. Youth mainly narrated Nicholas Ostrovsky's growth experience after he became an adult. It described his experiences in work, love, and faith, including his career, love stories, and religious beliefs. It showed a mature, confident, and religious character image, and also revealed his views and attitudes towards life, love, career, and faith. Through the growth of the protagonist in the trilogy, Tolstoy explored the philosophical issues of human nature, life, family, society, education and culture, which showed his literary talent and profound depth of thought.